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refactor(session): rename the seed boundary to end-seed

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Hypatia May
2026-07-30 15:32:06 +08:00
parent e8f0934bc2
commit 8527137230
44 changed files with 228 additions and 224 deletions
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docs/persistence-catalog.md
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@@ -78,7 +78,7 @@ export type SessionEvent<T extends SessionEventType = SessionEventType> = {
}[T]
```
Sources: [`packages/core/session/src/types.ts:278`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:285`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:314`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:346`](../packages/core/session/src/types.ts)
Sources: [`packages/core/session/src/types.ts:279`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:286`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:315`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:347`](../packages/core/session/src/types.ts)
## Events
@@ -404,34 +404,35 @@ Source: [`packages/sandbox/sandbox-policy/src/session-mode.ts:33`](../packages/s
### `session/*`
#### `session/inherited` — log-only
#### `session/end-seed` — log-only
```ts persistence-catalog
/**
* Log-only durable projection of {@link Session.firstLiveSeq}: everything
* below it was inherited through a constructor seed (resume, fork, or replay)
* and no writer in this lifecycle produced it. Payload is empty — position
* and `time` carry the meaning.
* Marks the end of a constructor seed. Events before it have smaller seq
* values and came from the seed (resume, fork, or replay); this lifecycle
* produced none of them. This log-only event is the durable projection of
* {@link Session.firstLiveSeq}. Its payload is empty — position and `time`
* carry the meaning.
*
* Locate the LAST one rather than reading `firstLiveSeq`: a seed already
* ending in a boundary is not re-marked, so reopening an untouched session
* does not grow its log per pickup.
* Locate the LAST one in stored history. A seed already ending in one is not
* re-marked, so reopening an untouched session does not grow its log per
* pickup and the event need not be at the current `firstLiveSeq`.
*
* `Session`'s constructor is the only legitimate writer. The invariant
* companion deliberately constrains nothing here, so a plugin appending one
* would silently turn every live bracket below it into dead history.
* would silently classify every live bracket before it as seed history.
*
* An owner of a standalone open/close bracket (`compact/start` …
* `compact/end`) reads it because inherited history and live work are
* otherwise byte-identical: an unmatched opening marker below the boundary
* belongs to an ended lifecycle, whatever ended it. NOT a liveness signal
* about other writers — a concurrently live session holds its own boundary
* elsewhere, so tolerating concurrent writers needs a signal beyond the log.
* `compact/end`) reads it because seed history and live work are otherwise
* byte-identical: an unmatched opening marker before this event belongs to
* an ended lifecycle, whatever ended it. NOT a liveness signal about other
* writers — a concurrently live session holds its own boundary elsewhere,
* so tolerating concurrent writers needs a signal beyond the log.
*/
'session/inherited': Record<string, never>
'session/end-seed': Record<string, never>
```
Source: [`packages/core/session/src/types.ts:274`](../packages/core/session/src/types.ts)
Source: [`packages/core/session/src/types.ts:275`](../packages/core/session/src/types.ts)
#### `session/title` — log-only